Changes in Characteristics of Drought/Flood and Its Connections with Monsoons in the Lancang River Basin

TANG Jian; ZHAI Wen-liang; CAO Hui-qun

doi:10.11988/ckyyb.20170749

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Journal of Changjiang River Scientific Research Institute ›› 2019, Vol. 36 ›› Issue (3) : 19-25. DOI: 10.11988/ckyyb.20170749

WATER RESOURCES AND ENVIRONMENT

Changes in Characteristics of Drought/Flood and Its Connections with Monsoons in the Lancang River Basin

TANG Jian^1,2, ZHAI Wen-liang^1,2, CAO Hui-qun^1,2

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Abstract

Studying the connections between drought/flood characteristics and monsoons in the Lancang River basin is of vital significance for understanding the causes, mechanisms and prediction of regional drought/flood disasters; yet the vast majority of existing studies are focused on the temporal and spatial evolution characteristics of drought/flood rather than on the connections between drought/flood characteristics and monsoons in the Lancang River basin. In this paper, the temporal and spatial changes in characteristics of drought/flood in 1957-2015 are investigated in terms of standard precipitation index (SPI12), monsoon index, and water vapor flux; the connections between drought/flood changes and monsoon index are examined, and the mechanism of drought/flood changes driven by monsoons and water vapor fluxes is further revealed. Results indicated that: (1) flood/drought has obvious regional difference, and the downstream area is prone to flood and drought; (2) the frequency of drought is superior to that of flood, showing an increasing trend in annual and seasonal time scales; (3) the frequencies of flood and drought mainly varied periodically at 3-5 years, 8-15 years, and 20-25 years; (4) in drought/flood period, indices of the South Asian monsoon and the Plateau monsoon have relatively strong correlations with the standard precipitation index (SPI12) in the Lancang River basin; such correlation varies in different regions due to the limited transportation distance of monsoons. The results are helpful in understanding the temporal and spatial change characteristics of drought/flood in the Lancang River basin, and also offer scientific basis for the decision-making of drought/flood prevention.

Key words

drought and flood / monsoon / standard precipitation index / water vapor flux / Lancang River basin

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TANG Jian, ZHAI Wen-liang, CAO Hui-qun. Changes in Characteristics of Drought/Flood and Its Connections with Monsoons in the Lancang River Basin[J]. Journal of Changjiang River Scientific Research Institute. 2019, 36(3): 19-25 https://doi.org/10.11988/ckyyb.20170749

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